Naslov
Energy-Dependent Chirality Effects in Quasifree-Standing Graphene

Autori
Dombrowski, Daniela ; Jolie, Wouter ; Petrović, Marin ; Runte, Sven ; Craes, Fabian ; Klinkhammer, Jürgen ; Kralj, Marko ; Lazić, Predrag ; Sela, Eran ; Busse, Carsten

Izvornik
Physical Review Letters (0031-9007) 118 (2017), 11; 116401, 6

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
graphene ; intercalation ; chirality ; electron scattering ; STM ; STS

Sažetak
We present direct experimental evidence of broken chirality in graphene by analyzing electron scattering processes at energies ranging from the linear (Dirac-like) to the strongly trigonally warped region. Furthermore, we are able to measure the energy of the van Hove singularity at the M point of the conduction band. Our data show a very good agreement with theoretical calculations for free-standing graphene. We identify a new intravalley scattering channel activated in case of a strongly trigonally warped constant energy contour, which is not suppressed by chirality. Finally, we compare our experimental findings with T-matrix simulations with and without the presence of a pseudomagnetic field and suggest that higher order electron hopping effects are a key factor in breaking the chirality near to the van Hove singularity.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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